Maybe there is variation from piece to piece. I have a ton of ibex (including shak, zepher, kate, tank), all the tops are small and bottoms (woolies) are XS. I only have one smartwool top in M (midweight zip T) and one mideweight bottom also in M (mideweight long underwear). I tried on a lot of icebreaker tops and bottoms in both S and M and was a solid S in everything but ended up not buying any.



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